80,000,000 Germans in one lump+the labor of n slaves+8 years of intense rearming and organization+frenzied fanaticism

​70,000,000 British in 4 continents+zero slaves+3 years of rearmament / no industrial mobilization+​dogged determination

The above equation appears in a letter dated June 1941 from General Raymond E. Lee, American Army observer in London, to Roosevelt. It presents his opinion that the British alone cannot defeat the Nazis whether one goes simply by the numbers above or by specific events observed in the field.